Angelica this is probably the trickiest challenge you have given us so far and I will now show you some of the ugliest manicure I've done indeed!Operatingsystems is the subject. My first thought was windows, um, no fun. Apple, no, that is no operating system it's a company name. Then I saw the Linux penguin icon. Come to think of it I have a stamping plate with a penguin on. Perfect!Took out my Cheeky CH43 plate painted white nails with Zoya Purity, it was after that everything started to go wrong. Because I thought it would be more fun with a black gradient on four of the fingers and the penguin on the ring finger.And it could have worked if I had not done this kind of half past nine one evening when I was super tired. The gradient certinaly didn't turn out the way I had planed it. And there are visible edges from different layers in some fingers, but the penguin is a little sweet anyway.Then, to fix this mess, I painted over the white nails with Zoya Raven. Careless. So sorry for a kind of ugly manicure that I did not have time to redo. But as I said the penguin is certainly cute!